Answer:
Ecosystem engineers are species that modify their environment in a significant manner, creating new habitats or modifying existing ones to suit their needs.
It is called hydrosphere
It is the total water in Earth.
Answer:
More than one of the above
Explanation:
I strongly recommend sticking with the prescribed dosage of a drug.
A drug works by binding itself to the receptor site of a cell or tissue by non-covalent interactions.
Repeated doses of the same drug however may make the drug start behaving as an inverse agonist by blocking (instead of binding) the receptor site of the cell thus inducing a reduced response instead of an increased response to the drug.